It’s a good way to frame someone: "It’s difficult to understand the motives for dumping boatloads of child pornography" on someone’s hard drive, says Terrence O’Brien in Switched. Some pedophiles "secretly store their highly illegal collections" on a host computer for remote viewing. But hackers can also do it to destroy the reputations of others. That’s way worse than stealing someone's credit card -- and much more costly for the victim."Viruses secretly downloading child pornography"

Pedophiles do this for self defense: Child porn purveyors also put Trojan-horse viruses on unsuspecting computers so that if the real pedophile is caught, says John Leyden in The Register, they can claim the "Trojan did it" defense. That makes it doubly bad for the innocent malware victim, because that defense is now "understandably met with skepticism from law enforcement professionals.""How malware frames the innocent for child abuse"